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United States Patent | 5,671,716 |
Hetrick ,   et al. | September 30, 1997 |
A fuel injection system used in the intake air passageway of an internal combustion engine has a strategy for reducing cold start hydrocarbon emissions. The fuel injector has an actuator which allows the fuel spray pattern to be varied from one which is widely dispersed and atomized to one which is only weakly dispersed. A strategy for varying the spray pattern during the engine warm-up period after cold start is disclosed. The strategy increases evaporation within the passageway so that cold start overfuelling and attendant hydrocarbon emissions are reduced.
Inventors: | Hetrick; Robert Eugene (Dearborn Heights, MI); Hilbert; Harold Sean (Canton, MI); Parsons; Michael Howard (Ann Arbor, MI); Stockhausen; William Francis (Northville, MI) |
Assignee: | Ford Global Technologies, Inc. (Dearborn, MI) |
Appl. No.: | 725045 |
Filed: | October 3, 1996 |
Current U.S. Class: | 123/491 |
Intern'l Class: | F02M 051/00 |
Field of Search: | 123/491,446,578,506,502,129.17,531,472,494 239/690,706,97 60/740,741,742 |
3616784 | Nov., 1971 | Barr | 123/179. |
3716034 | Feb., 1973 | Schmid | 123/179. |
4077374 | Mar., 1978 | Willmann et al. | 123/536. |
4753211 | Jun., 1988 | Hofer | 123/502. |
4753212 | Jun., 1988 | Miyaki et al. | 123/506. |
4936280 | Jun., 1990 | Langlois | 123/578. |
5033439 | Jul., 1991 | Eygret | 123/491. |
5054458 | Oct., 1991 | Wechem et al. | 239/135. |
5129381 | Jul., 1992 | Nakajima | 123/531. |
5181494 | Jan., 1993 | Ausman et al. | 123/446. |
5224458 | Jul., 1993 | Okada et al. | 123/531. |
5234170 | Aug., 1993 | Schirmer et al. | 123/538. |
5598826 | Feb., 1997 | Hunt et al. | 123/491. |